diff --git a/const_string.c b/const_string.c
index 759b915..9832baa 100644
--- a/const_string.c
+++ b/const_string.c
@@ -69,6 +69,8 @@ const char *xc_get_data_type(zend_uchar data_type)
 #	include "const_string_opcodes_php5.1.h"
 #elif defined(ZEND_ENGINE_2)
 #	include "const_string_opcodes_php5.0.h"
+#else
+#	include "const_string_opcodes_php4.x.h"
 #endif
 
 zend_uchar xc_get_opcode_count()
diff --git a/processor/processor.m4 b/processor/processor.m4
index 1c82ec4..8d00efc 100644
--- a/processor/processor.m4
+++ b/processor/processor.m4
@@ -508,8 +508,10 @@ DEF_STRUCT_P_FUNC(`zend_op_array', , `dnl {{{
 		dst->refcount[0] = 1000;
 		/* deep */
 		STRUCT_P(HashTable, static_variables, HashTable_zval_ptr)
+#ifdef ZEND_ENGINE_2
 		STRUCT_ARRAY_I(num_args, zend_arg_info, arg_info)
 		xc_gc_add_op_array(dst TSRMLS_CC);
+#endif
 		define(`SKIPASSERT_ONCE')
 	}
 	else
diff --git a/utils.c b/utils.c
index f88af50..9c71cf6 100644
--- a/utils.c
+++ b/utils.c
@@ -786,6 +786,7 @@ void xc_sandbox_free(xc_sandbox_t *sandbox, xc_install_action_t install TSRMLS_D
 	/* restore orig here, as EG/CG holded tmp before */
 	memcpy(&EG(included_files), &OG(included_files), sizeof(EG(included_files)));
 
+#ifdef E_STRICT
 	if (sandbox->compilererrors) {
 		int i;
 		for (i = 0; i < sandbox->compilererror_cnt; i ++) {
@@ -793,6 +794,7 @@ void xc_sandbox_free(xc_sandbox_t *sandbox, xc_install_action_t install TSRMLS_D
 		}
 		efree(sandbox->compilererrors);
 	}
+#endif
 	if (sandbox->alloc) {
 		efree(sandbox);
 	}
diff --git a/xcache.c b/xcache.c
index db39b4e..e437ee5 100644
--- a/xcache.c
+++ b/xcache.c
@@ -1481,6 +1481,7 @@ int xc_is_shm(const void *p) /* {{{ */
 }
 /* }}} */
 
+#ifdef ZEND_ENGINE_2
 /* {{{ xc_gc_op_array_t */
 typedef struct {
 	zend_uint num_args;
@@ -1492,7 +1493,9 @@ void xc_gc_add_op_array(zend_op_array *op_array TSRMLS_DC) /* {{{ */
 	xc_gc_op_array_t gc_op_array;
 	gc_op_array.num_args = op_array->num_args;
 	gc_op_array.arg_info = op_array->arg_info;
+#ifdef ZEND_ENGINE_2
 	zend_hash_next_index_insert(&XG(gc_op_arrays), (void *) &gc_op_array, sizeof(gc_op_array), NULL);
+#endif
 }
 /* }}} */
 static void xc_gc_op_array(void *pDest) /* {{{ */
@@ -1510,6 +1513,7 @@ static void xc_gc_op_array(void *pDest) /* {{{ */
 	}
 }
 /* }}} */
+#endif
 
 /* module helper function */
 static int xc_init_constant(int module_number TSRMLS_DC) /* {{{ */
@@ -1743,7 +1747,9 @@ static void xc_request_init(TSRMLS_D) /* {{{ */
 		}
 	}
 
+#ifdef ZEND_ENGINE_2
 	zend_hash_init(&XG(gc_op_arrays), 32, NULL, xc_gc_op_array, 0);
+#endif
 
 #if PHP_API_VERSION <= 20041225
 	XG(request_time) = time(NULL);
@@ -1759,7 +1765,9 @@ static void xc_request_init(TSRMLS_D) /* {{{ */
 static void xc_request_shutdown(TSRMLS_D) /* {{{ */
 {
 	xc_entry_unholds(TSRMLS_C);
+#ifdef ZEND_ENGINE_2
 	zend_hash_destroy(&XG(gc_op_arrays));
+#endif
 	xc_gc_expires_php(TSRMLS_C);
 	xc_gc_expires_var(TSRMLS_C);
 	xc_gc_deletes(TSRMLS_C);
diff --git a/xcache_globals.h b/xcache_globals.h
index a22389b..9de7f26 100644
--- a/xcache_globals.h
+++ b/xcache_globals.h
@@ -17,7 +17,9 @@ ZEND_BEGIN_MODULE_GLOBALS(xcache)
 	time_t request_time;
 	long   var_ttl;
 
+#ifdef ZEND_ENGINE_2
 	HashTable gc_op_arrays;
+#endif
 
 	HashTable internal_function_table;
 	HashTable internal_class_table;